Arc-lamp.



ARC LAMP. APPLICATION FILED our. 31,1906.

U. A. B. HALVORSON, JR.

UNITED STATES PATENT OFFICE.

CROMWELL A. B. HALVORSON, JR., OF LYNN, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

lino-LAME Specification of Letters Patent.

- Patented Dec. 1, 1908.

Application filed. October 31, 1906. Serial No. 341,409.

To all whom it may concern: I t

Be it known that I, CROMWELL A. B. HAL- voRsoN, Jr., a. citizen. of the United States, residin at Lynn, county of Essex, State of Massac usetts, have invented certain new and useful Improvements in Arc-Lamps,,of which the following is a specification.

My invention relates to electric lamps of the type employing electrodes of such a character that a flaming or luminous arc is obtained. I

-It is customary to use a non-consuming positive electrode made of copper or some other good conductor-of electricity and heat. As the negative electrode is consumed fumes are given off and these condense more or less on the positive electrode, forming thereon an objectionable coating which, if not removed, interferes with the successful operation of the lamp. p

The present invention contemplates means for preventing the formation of any considerable coating by periodically removing such material asmay be deposited upon the electrode.

To this end my 1 invention comprises a novel construction and'arran ement of parts to be hereinafter particularly pointed out in the claims. For a full understanding of my invention, however, and of its objects and advantages reference-may be had to the following detailed description taken in con-' nection with the accompanying drawing.

In said drawing, Figure 1 shows conventionally a lamp and the circuit connections thereto, the positive electrode being pivotally supported in accordance with-one modification of myinvention; Fig. 2 is a side elevation of a chimney within which a positive electrode is supported, together with an auxiliary cleaning. device for said electrode, a portion of the wall of the chimney being broken away to more clearly show the electrode and cleaning device; and Fig. 3

is an end View of the electrode and a portion of the cleaning device shown in Fig. 2.

' The lamp shown in Fi is, with the exception 0% the positive electrode, identical with that disclosed in an application, Serial No. 296,304, filed by Richard Fleming and myself 6n the 16th day of J anuar' 1906; but it will, of course, be understoo that my invention is applicable to any rorm of luminous arc lamp and 1 of the drawing is not confined to the trated. I Referring to the drawing, 1 and 2 are the positive and negative electrodes, respectively. The electrode 2 is of any usual kind supported upon a rod or tube 3 and being fed in the'usual manner by clutch mechanparticular lamp illusism l controlled by an electrom'agnet 5/ All these parts, with the exception of the been deposited thereon is dislodged. The

form of the positive electrode and the manner of-movably supporting itin the path of the negative electrode may be varied, but the electrode may conveniently consist of a bar extending transversely of the chimney and] pivoted at one end, as at 7, to some part of the chimney. The free endof the electrode, or a part 8 secured thereto, may extend through an elongated slot 9 in the opposite wall of the chimney,

is struck, 1s free to swing through a limited angle determined by the length of the slot.

The member 8 may conveniently. serve as the terminal to which a lead 10, connected -to the whereby the electrode, i wliile supported at both ends after the are positive side of the line 11, is secured. This lead may be in electrical engagement with the chimney so thatcurrent may also flow to the positive electrode through the chimney and the pivot upon which the electrode is supported. It will be seen that whenever" the lower electrode is raised, the positive electrode will be swung about its pivot and the member 8 caused to' strike against the upper end of the .slot'. When the negative.

electrode is again lowered to the operative position, the positive electrode drops Ill'lfll the member 8 strikes the lower wall of" the slot and the electrode-then remains in that position until the next feeding operation takes place. The jarring of the electrode produced by this succession of blows causes any deposit to be loosened and to drop away.

In Fig. 2 there is shown a further modification wherein the jarring action upon the positive electrode is assisted by a mechanical; The electrode 1 may be scraping device. similar to the electrode 1, being pivoted at one side of the chimney 6 12 is a fork which embraces the electrode 1; this fork being supported upon one end of a bell crank lever 13 pivoted-to the chimney at 14%, and-being adapted, when the lever is rocked from the position shown in full lines to the position shown in dotted lines, to scrape 1 along the sides of the electrode and remove therefrom anyforeign substance which may have collected thereon. The bell crank lever may be operated in any suitable manner; the operation being conveniently eiiected by means of a rod 15 connected to the core 5 of the main regulating magnet, so that,

whenever the lamp is started or the lower electrode is fed, the scraper is operated across the electrode 111 themanner described. While I have illustrated and described in 1' me, it will be evident that the cleaning p t the positive electrode may he carried out nous ways and that therefore my 111- ii, in its broadest aspects, is not limited partichlar construction and arrangeof parts shown.

lat I. claim as new and desire to secure itters Patent of the United States, is,- i. In an arc lamp, a pendulously supportl the best forms of my invention known ed electrode, stops in the path of the oscillatory movements of that electrode, a second electrode, and means for operating the latter electrode to "strike the first named electrode to oscillate the same between and into forci ble contact with the stops. V

2. In an arc lamp, a pendulously supported positive electrode and a negative electrode, means for actuating the latter to oscillate the former, a scraper, and means for moving said scraper across the surface of the positive electrode while the same oscillates.

3. In an arc lamp, positive and negative electrodes, a scraper, an electromagnet for actuating the negative electrode to strike and oscillate the positive electrode, and a connection between said electromagnet and said scraper for causing the latter to move across the surface of the positive electrode when the GROMWELL AJB: HALVORSONJR.

Witnesses:

BENJAMIN B. HULL, HELEN ORFORD. 

